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Sorry to be a smartass, buy why ask for help if you don't want to hear any solutions? I still say check out the EGR system. It may not be that the valve itself is clogged, it may just not be operating at all. Who knows. That would still be the best place to start unless you want to keep throwing parts at the problem. If it is all good, at least that will be eliminated from the very good possibility list.
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